Grok 4.20 Multi-Agent vs Grok Code Fast 1
Grok 4.20 Multi-Agent (2026) and Grok Code Fast 1 (2025) are agentic coding models from xAI. Grok 4.20 Multi-Agent ships a 2M-token context window, while Grok Code Fast 1 ships a 262K-token context window. On pricing, Grok Code Fast 1 costs $0.2/1M input tokens versus $1.25/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit.
Grok Code Fast 1 is ~525% cheaper at $0.2/1M; pay for Grok 4.20 Multi-Agent only for reasoning depth.
Decision scorecard
Local evidence first| Signal | Grok 4.20 Multi-Agent | Grok Code Fast 1 |
|---|---|---|
| Decision fit | RAG, Agents, and Long context | Coding, RAG, and Agents |
| Context window | 2M | 262K |
| Cheapest output | $2.5/1M tokens | $1.5/1M tokens |
| Provider routes | 2 tracked | 1 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- Grok 4.20 Multi-Agent has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Grok 4.20 Multi-Agent has broader tracked provider coverage for fallback and procurement flexibility.
- Grok 4.20 Multi-Agent uniquely exposes Reasoning in local model data.
- Local decision data tags Grok 4.20 Multi-Agent for RAG, Agents, and Long context.
- Grok Code Fast 1 has the lower cheapest tracked output price at $1.5/1M tokens.
- Local decision data tags Grok Code Fast 1 for Coding, RAG, and Agents.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output prices on this page.
Grok 4.20 Multi-Agent
$1,625
Cheapest tracked route: xAI Console
Grok Code Fast 1
$535
Cheapest tracked route: OpenRouter
Estimated monthly gap: $1,090. Batch, cache, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- Grok Code Fast 1 is $1/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Reasoning before moving production traffic.
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- Grok 4.20 Multi-Agent is $1/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Grok 4.20 Multi-Agent adds Reasoning in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-01-01 | 2025-08-27 |
| Context window | 2M | 262K |
| Parameters | — | 314B |
| Architecture | - | mixture of experts |
| License | Proprietary | Proprietary |
| Knowledge cutoff | - | - |
Pricing and availability
| Pricing attribute | Grok 4.20 Multi-Agent | Grok Code Fast 1 |
|---|---|---|
| Input price | $1.25/1M tokens | $0.2/1M tokens |
| Output price | $2.5/1M tokens | $1.5/1M tokens |
| Providers |
Capabilities
| Capability | Grok 4.20 Multi-Agent | Grok Code Fast 1 |
|---|---|---|
| Vision | No | No |
| Multimodal | No | No |
| Reasoning | Yes | No |
| Function calling | Yes | Yes |
| Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | No | No |
Benchmarks
No shared benchmark rows are currently sourced for this pair.
Deep dive
The capability footprint differs most on reasoning mode: Grok 4.20 Multi-Agent. Both models share function calling, tool use, and structured outputs, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
For cost, Grok 4.20 Multi-Agent lists $1.25/1M input and $2.5/1M output tokens, while Grok Code Fast 1 lists $0.2/1M input and $1.5/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Grok Code Fast 1 lower by about $1.04 per million blended tokens. Availability is 2 providers versus 1, so concentration risk also matters.
Choose Grok 4.20 Multi-Agent when reasoning depth, larger context windows, and broader provider choice are central to the workload. Choose Grok Code Fast 1 when coding workflow support and lower input-token cost are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship. This keeps the decision grounded in measurable tradeoffs instead of brand-level assumptions. It also helps separate model capability from provider packaging, which can change cost and latency.
FAQ
Which has a larger context window, Grok 4.20 Multi-Agent or Grok Code Fast 1?
Grok 4.20 Multi-Agent supports 2M tokens, while Grok Code Fast 1 supports 262K tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Which is cheaper, Grok 4.20 Multi-Agent or Grok Code Fast 1?
Grok Code Fast 1 is cheaper on tracked token pricing. Grok 4.20 Multi-Agent costs $1.25/1M input and $2.5/1M output tokens. Grok Code Fast 1 costs $0.2/1M input and $1.5/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Grok 4.20 Multi-Agent or Grok Code Fast 1 open source?
Grok 4.20 Multi-Agent is listed under Proprietary. Grok Code Fast 1 is listed under Proprietary. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for reasoning mode, Grok 4.20 Multi-Agent or Grok Code Fast 1?
Grok 4.20 Multi-Agent has the clearer documented reasoning mode signal in this comparison. If reasoning mode is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for function calling, Grok 4.20 Multi-Agent or Grok Code Fast 1?
Both Grok 4.20 Multi-Agent and Grok Code Fast 1 expose function calling. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Where can I run Grok 4.20 Multi-Agent and Grok Code Fast 1?
Grok 4.20 Multi-Agent is available on OpenRouter and xAI Console. Grok Code Fast 1 is available on OpenRouter. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
Continue comparing
Last reviewed: 2026-05-14. Data sourced from public model cards and provider documentation.